High Speed Digital Systems High Speed Digital Systems laboratorylaboratory

Midterm PresentationSpring 2009

Cellular Signal Source

Student : Hammad Abed Essam Masarwi

Instructor: Yossi Hipsh

Project Description Project Description Designing Pulser which will illustrate

how the cellular works during receiving and transmitting sms message.

Pulser - will create a single / packet made of a short (0.5-1 nsec)/ long(10-13 nsec) pulse signal, with very low rise/fall time (200ps).

Block DiagramBlock Diagram

Splitter

MC100EP11

OSC

F=50MHz

AND

MC100EP05

MUX

NC7SV157 MUX ים בוחרים בין יציאת-

BNCהרכיב הקודם לבין כניסת

1 Shot

MC74LCX74

MUX

Delay ChipMC100EP19

5

SN74LVC1T45DBVR

Translater

MC100EPT20 Delay Chip

MC100EP195

MicrostriplineExternal controllers (Dip switches)

ECL technology

Signals waveformSignals waveform

After and operation~0.5nsec

Signal 1 after the translator and the delay

Signal 2 after the translator and the delay

Splitting the signal

Oscillator waveform

Vcc

Gnd

Level “1”

1-shot waveform

12ns

Level “0”

8ns

WIDE

SHOW THE SLOPES

OutputOutput

output

Q

Q#

DC hight

Output #

D-1318 PCB development D-1318 PCB development ::D-1318 Block diagram Electrical schemeTable of components and statusComponents places upon the

printed board

PCB stack upPCB stack up

FR4Insulator -

1 Oz = 0.035 m”m

1 Oz = 0.035 m”m

PCB thickness ~1.6m”m

Components & microstriplines

GND

Vtt = 1.33[Volt]

Vcc = 3.3 [Volt]

Signal control L1

Signal control L2

FR4

FR4

FR4

FR4

FR4

Parts ListParts ListName Component

codeStatus

1. Oscillator K1144ACE Valid

2. Mux NC7SV157 Valid

3. Dual supply bus SN74LVC1T45DBVR

Valid

4. 1-shot (Flip flops) MC74LCX74 Valid

5. Translator TTL to ECL MC100EPT20 Valid

6. Splitter MC100EP11 Valid

7. Programmable delay chip

MC100EP195 Valid

8. AND gate MC100EP05 Valid

9. SMA connectors - Valid

10.

Dip switch 4 switches 76RSB04ST Valid

11.

Dip switch 12 switches 76RSB12ST Valid

12.

Capacitors - Valid

13.

Resistors - Valid

Electrical schemeElectrical scheme

High speed Transmit ion High speed Transmit ion lineslines MC100EPT20 MC100EP11

1. pin 2 pin 72. pin 3 pin 6

MC100EP11 (1),(2) MC100EP1951. pin 1 pin 4 (1)2. pin 2 pin 5 (1)3. pin 3 pin 4 (2)4. pin 4 pin 5 (2)

MC100EP195 (1),(2) MC100EP051. pin 21 (1) pin 12. pin 20 (1) pin 2 3. pin 21 (2) pin 34. pin 20 (2) pin 4

MC100EP05 (OUTPUT) Pins : 6,7

Microstripline features (PCB Microstripline features (PCB editor) editor)

Microstripline

Metal 1

t

h

w

Z0 = impedance of free space.

dielectric constant of substrate.w = width of strip.h = thickness ('height') of substrate .t = thickness of strip metallization.

ReferencesReferencesWikipedia

http://en.wikipedia.org/wiki/Microstrip

Microwaves, K. C. Gupta, New age international p. 198-201 .